Android - Force browser to hide nav & tab bar

Sadly Google Chrome and other browsers don't have a feature to hide the url bar and tab bar. One alternative is the app Full Screen Browser. Its features are:

• Web browser that allows for full screen viewing.
• Hide or dim navigation bar (Home, Back etc).
• Hide action/status bar

I am using Fully Kiosk Browser to read books on https://openlibrary.org

It works great. Key features:

• Immersive mode from the start
• Ability to choose screen orientation without having to enable rotation system wide. I like reading in landscape. There is also reverse landscape.
• Home screen shortcut for the website (library or book in my case) so that we can quickly jump into reading.
• No ads or any other nonsense